Complete your custom motorsport braking setup with the XC3 Engineering 368mm Front Rotor Bells. Specifically developed for the BMW F8X platform, these bells are precision-designed to adapt ex-BTCC (British Touring Car Championship) 368mm x 36mm racing brake rotors to your factory F8X hubs. This allows enthusiasts to access elite, professional-tier touring car braking components at a fraction of standard cost.

CNC-machined in the UK from high-tensile 6082-T6 billet aluminum, these rotor bells offer incredible thermal stability and significant weight reduction over traditional cast hats. Finished in a premium hard-anodized coating to resist extreme track heat and corrosion, they utilize a floating bobbin design to allow the outer iron rotor to expand freely, eliminating high-temperature warping and brake judder.

Part Number: XC3-RB-F8X-368

Key Features

– CNC-machined from high-strength 6082-T6 structural billet aluminum alloy
– Premium hard-anodized finish for exceptional resistance to heat and brake dust corrosion
– Engineered specifically to adapt ex-BTCC 368mm x 36mm rotors to factory F8X front hubs
– Designed for floating mount bobbin systems to allow proper thermal expansion cycles
– Proudly designed, tested, and machined entirely in the United Kingdom

Benefits

– Significantly lowers unsprung weight and rotational mass for sharper steering response
– Facilitates the use of cost-effective, high-end ex-BTCC race team rotors on road/track cars
– Prevents brake rotor warping, pad tapering, and steering vibration under severe heat cycles
– Backed by the robust XC3 Engineering Lifetime Warranty for complete peace of mind at the limit

Dimensions

– Material: 6082-T6 Billet Aluminum Matrix
– Application: Front Hub 2-Piece Rotor Adaptor (Axle Pair)
– Rotor Compatibility: 368mm x 36mm BTCC specification outer rings

FAQ

Q: Are these sold individually or as a complete front pair?
A: These aluminum rotor bells are priced and supplied as a complete matching pair (two bells total) for the front axle assembly.

Q: Where do I source the replacement 368mm outer iron rotors?
A: The outer iron rotors are ex-BTCC championship used parts. Because AP Racing supplies these unique 368mm x 36mm dimensions exclusively to BTCC racing teams, they aren't available on the open public market. We regularly stock inspected replacement outer rotors directly on our store when yours eventually require replacement.

Q: Does this kit include the bobbins and mounting hardware?
A: This listing includes the two CNC-machined aluminum bells only. The floating bobbin kits and mounting fasteners can be purchased separately on our store or as part of our complete F8X BTCC Big Brake Kit.

Fitment

– 2016-2021 BMW F87 M2 / M2 Competition / M2 CS
– 2015-2018 BMW F80 M3 / M3 Competition / M3 CS
– 2015-2020 BMW F82 M4 Coupe / M4 Competition / M4 GTS
– 2015-2020 BMW F83 M4 Convertible
Note: Requires the use of AP Racing CP9660 calipers and corresponding XC3 caliper carrier brackets for proper offset and pad sweeping clearance.

If you are unsure on fitment, please message us with your registration or VIN and we will confirm compatibility before purchase.